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### Description
<!-- Explain what you did, what you expected to happen, and what actually happened. -->
Intermittent CRITICAL memory use after free at startup.
### Troubleshooting
#### Reproduction
<!-- If the issue can be reproduced, describe how it can be done. -->
This happens intermittently on startup. Because our container restarts automatically and the issue is not seen other than at startup it is ultimately innocuous. But the restarts are a false alarm for sys admin.
#### Debugging Data
<!-- If you got a core dump, use gdb to extract troubleshooting data - full backtrace, local variables and the list of the code at the issue location.
gdb /path/to/kamailio /path/to/corefile bt full info locals list
If you are familiar with gdb, feel free to attach more of what you consider to be relevant. -->
``` (paste your debugging data here) ```
#### Log Messages
<!-- Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->
``` Sep 10 15:29:22 product-name process-name[1764]: new user 'admin@172.51.1.1' added Sep 10 15:29:22 product-name process-name[1764]: Starting xxxx 1.5.8-0+gxxxxxxxx Sep 10 15:29:22 product-name process-name[1764]: Setting core dump pattern Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_init.c:503]: init_tls_compression(): disabling compression... Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: <core> [core/sctp_core.c:74]: sctp_core_check_support(): SCTP API not enabled - if you want to use it, load sctp module Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: <core> [core/tcp_main.c:5042]: init_tcp(): using epoll_lt as the io watch method (auto detected) Sep 10 15:29:22 product-name process-name[1764]: Listening on Sep 10 15:29:22 product-name process-name[1764]: udp: 172.51.1.1:5060 advertise 172.51.1.1:5060 Sep 10 15:29:22 product-name process-name[1764]: tcp: 172.51.1.1:5060 advertise 172.51.1.1:5060 Sep 10 15:29:22 product-name process-name[1764]: tls: 172.51.1.1:5061 advertise 172.51.1.1:5060 Sep 10 15:29:22 product-name process-name[1764]: Aliases: Sep 10 15:29:22 product-name process-name[1764]: tls: bb48d50a0892:5061 Sep 10 15:29:22 product-name process-name[1764]: tcp: bb48d50a0892:5060 Sep 10 15:29:22 product-name process-name[1764]: udp: bb48d50a0892:5060 Sep 10 15:29:22 product-name process-name[1764]: *: 172.51.1.1:* Sep 10 15:29:22 product-name process-name[1764]: Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: db_sqlite [db_sqlite.c:218]: mod_init(): SQlite library version 3.16.2 (compiled using 3.16.2) Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: rr [../outbound/api.h:52]: ob_load_api(): unable to import bind_ob - maybe module is not loaded Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: rr [rr_mod.c:177]: mod_init(): outbound module not available Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: http_async_client [http_async_client_mod.c:222]: mod_init(): Initializing Http Async module Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: [App] xxxx init Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: [---] Location reporting format: custom-1 Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: [---] Logging of location reporting: DISABLED Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_mod.c:377]: mod_init(): With ECDH-Support! Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_mod.c:380]: mod_init(): With Diffie Hellman Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: auth [auth_mod.c:345]: mod_init(): qop set, but nonce-count (nonce_count) support disabled Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_init.c:719]: init_tls_h(): compiled with openssl version "OpenSSL 1.0.2u 20 Dec 2019" (0x1000215f), kerberos support: off, compression: on Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_init.c:723]: init_tls_h(): installed openssl library version "OpenSSL 1.0.2u 20 Dec 2019" (0x1000215f), kerberos support: off, zlib compression: off Sep 10 15:29:22 product-name process-name[1764]: compiler: gcc -I. -I.. -I../include -fPIC -DOPENSSL_PIC -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -m64 -DL_ENDIAN -g -O2 -fdebug-prefix-map=/build/openssl1.0-NNAFzi/openssl1.0-1.0.2u=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -Wl,-z,relro -Wa,--noexecstack -Wall -DMD32_REG_T=int -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DRC4_ASM -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM -DWHIRLPOOL_ASM -DGHASH_ASM -DECP_NISTZ256_ASM Sep 10 15:29:22 product-name process-name[1764]: 0(1) WARNING: tls [tls_init.c:784]: init_tls_h(): openssl bug #1491 (crash/mem leaks on low memory) workaround enabled (on low memory tls operations will fail preemptively) with free memory thresholds 7864320 and 3932160 bytes Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: <core> [core/cfg/cfg_ctx.c:595]: cfg_set_now(): tls.low_mem_threshold1 has been changed to 7864320 Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: <core> [core/cfg/cfg_ctx.c:595]: cfg_set_now(): tls.low_mem_threshold2 has been changed to 3932160 Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: <core> [main.c:2779]: main(): processes (at least): 15 - shm size: 67108864 - pkg size: 8388608 Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: <core> [core/udp_server.c:154]: probe_max_receive_buffer(): SO_RCVBUF is initially 212992 Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: <core> [core/udp_server.c:206]: probe_max_receive_buffer(): SO_RCVBUF is finally 425984 Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: http_async_client [async_http.c:101]: async_http_init_sockets(): inter-process event notification sockets initialized Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: http_async_client [async_http.c:101]: async_http_init_sockets(): inter-process event notification sockets initialized Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:303]: ksr_tls_fill_missing(): TLSs<default>: tls_method=18 Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:315]: ksr_tls_fill_missing(): TLSs<default>: certificate='/etc/kamailio/publickey.pem' Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:322]: ksr_tls_fill_missing(): TLSs<default>: ca_list='(null)' Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:329]: ksr_tls_fill_missing(): TLSs<default>: crl='(null)' Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:333]: ksr_tls_fill_missing(): TLSs<default>: require_certificate=0 Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:340]: ksr_tls_fill_missing(): TLSs<default>: cipher_list='(null)' Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:347]: ksr_tls_fill_missing(): TLSs<default>: private_key='/etc/kamailio/privatekey.pem' Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:351]: ksr_tls_fill_missing(): TLSs<default>: verify_certificate=0 Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:354]: ksr_tls_fill_missing(): TLSs<default>: verify_depth=9 Sep 10 15:29:22 product-name process-name[1764]: 0(1) NOTICE: tls [tls_domain.c:1087]: ksr_tls_fix_domain(): registered server_name callback handler for socket [:0], server_name='<default>' ... Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:707]: set_verification(): TLSs<default>: No client certificate required and no checks performed Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:303]: ksr_tls_fill_missing(): TLSc<default>: tls_method=18 Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:315]: ksr_tls_fill_missing(): TLSc<default>: certificate='(null)' Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:322]: ksr_tls_fill_missing(): TLSc<default>: ca_list='/etc/kamailio/sipcacert.pem' Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:329]: ksr_tls_fill_missing(): TLSc<default>: crl='(null)' Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:333]: ksr_tls_fill_missing(): TLSc<default>: require_certificate=1 Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:340]: ksr_tls_fill_missing(): TLSc<default>: cipher_list='(null)' Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:347]: ksr_tls_fill_missing(): TLSc<default>: private_key='(null)' Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:351]: ksr_tls_fill_missing(): TLSc<default>: verify_certificate=1 Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:354]: ksr_tls_fill_missing(): TLSc<default>: verify_depth=9 Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: tls [tls_domain.c:692]: set_verification(): TLSc<default>: Server MUST present valid certificate Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: http_async_client [async_http.c:84]: async_http_init_worker(): started worker process: 1 Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: http_async_client [async_http.c:84]: async_http_init_worker(): started worker process: 2 Sep 10 15:29:22 product-name process-name[1764]: 8(160) INFO: ctl [io_listener.c:214]: io_listen_loop(): io_listen_loop: using epoll_lt io watch method (config) Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: <core> [main.c:783]: handle_sigs(): SIGCHLD received, but no child has stopped, ignoring it Sep 10 15:29:22 product-name process-name[1764]: 6(158) CRITICAL: <core> [core/mem/q_malloc.c:646]: qm_realloc(): BUG: trying to realloc an already freed pointer 0x7f7d3413f928 , fragment 0x7f7d3413f8f0 -- aborting Sep 10 15:29:22 product-name process-name[1764]: 14(166) CRITICAL: <core> [core/pass_fd.c:277]: receive_fd(): EOF on 23 Sep 10 15:29:22 product-name process-name[1764]: 0(1) ALERT: <core> [main.c:766]: handle_sigs(): child process 158 exited by a signal 6 Sep 10 15:29:22 product-name process-name[1764]: 0(1) ALERT: <core> [main.c:769]: handle_sigs(): core was not generated Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: <core> [main.c:792]: handle_sigs(): terminating due to SIGCHLD Sep 10 15:29:22 product-name process-name[1764]: 1(153) INFO: <core> [main.c:847]: sig_usr(): signal 15 received Sep 10 15:29:22 product-name process-name[1764]: 2(154) INFO: <core> [main.c:847]: sig_usr(): signal 15 received Sep 10 15:29:22 product-name process-name[1764]: 4(156) INFO: <core> [main.c:847]: sig_usr(): signal 15 received Sep 10 15:29:22 product-name process-name[1764]: 14(166) CRITICAL: <core> [core/pass_fd.c:277]: receive_fd(): EOF on 15 Sep 10 15:29:22 product-name process-name[1764]: 3(155) INFO: <core> [main.c:847]: sig_usr(): signal 15 received Sep 10 15:29:22 product-name process-name[1764]: 14(166) CRITICAL: <core> [core/pass_fd.c:277]: receive_fd(): EOF on 18 Sep 10 15:29:22 product-name process-name[1764]: 7(159) INFO: <core> [main.c:847]: sig_usr(): signal 15 received Sep 10 15:29:22 product-name process-name[1764]: 5(157) INFO: <core> [main.c:847]: sig_usr(): signal 15 received Sep 10 15:29:22 product-name process-name[1764]: 9(161) INFO: <core> [main.c:847]: sig_usr(): signal 15 received Sep 10 15:29:22 product-name process-name[1764]: 10(162) INFO: <core> [main.c:847]: sig_usr(): signal 15 received Sep 10 15:29:22 product-name process-name[1764]: 8(160) INFO: <core> [main.c:847]: sig_usr(): signal 15 received Sep 10 15:29:22 product-name process-name[1764]: 11(163) INFO: <core> [main.c:847]: sig_usr(): signal 15 received Sep 10 15:29:22 product-name process-name[1764]: 14(166) INFO: <core> [main.c:847]: sig_usr(): signal 15 received Sep 10 15:29:22 product-name process-name[1764]: 13(165) INFO: <core> [main.c:847]: sig_usr(): signal 15 received Sep 10 15:29:22 product-name process-name[1764]: 12(164) INFO: <core> [main.c:847]: sig_usr(): signal 15 received Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: db_sqlite [db_sqlite.c:227]: mod_destroy(): SQlite terminate Sep 10 15:29:22 product-name process-name[1764]: 0(1) INFO: <core> [core/sctp_core.c:53]: sctp_core_destroy(): SCTP API not initialized
```
#### SIP Traffic
<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->
``` Occurs at startup before SIP traffic relevant. ```
### Possible Solutions
<!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix. -->
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
``` version: kamailio 5.3.4 (x86_64/linux) f7690e-dirty flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: f7690e -dirty compiled with gcc 6.3.0 ```
* **Operating System**:
<!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `uname -a`) -->
``` Running under docker on Centos 7 Linux bb48d50a0892 3.10.0-1062.el7.x86_64 #1 SMP Wed Aug 7 18:08:02 UTC 2019 x86_64 GNU/Linux ```